Chapter 3: The Cellular Level of Organization Principles of Anatomy and Physiology, 12th Edition, by Bryan Derrickson, Gerald Tortora.

Principles of Anatomy and Physiology, 12th Edition, by Bryan Derrickson, Gerald Tortora. Multiple Choice & Essays 1. What are the three main parts of a eukaryotic cell? a. Plasma membrane, organelles, cytoplasm b. Plasma membrane, organelles, nucleus c. Plasma membrane, cytoplasm, organelles d. Plasma membrane, cytoplasm, nucleus e. Plasma membrane, cytosol, organelles Ans: D Difficulty: medium Feedback: 3.1 2. Briefly describe the fluid mosaic model. Ans: The fluid mosaic model represents the molecular arrangement of the plasma membrane as an ever moving sea of fluid lipids that contain a mosaic of many different proteins. Difficulty: medium Feedback: 3.2 3. Plasma membranes consist of what three components? a. Phospholipids, glycoproteins, water b. Proteins, cholesterol, fatty acids c. Cholesterol, fatty acids, glycolipids d. Proteins, phospholipids, cholesterol e. Water, proteins, fatty acids Ans: D Difficulty: medium Feedback: 3.2 4. What are the nonpolar parts of a phospholipid? a. Head group b. Tail group c. Both are nonpolar d. Neither are nonpolar Ans: B Difficulty: medium Feedback: 3.2 5. This is the only polar portion of a cholesterol molecule and it forms hydrogen bonds with the polar heads of phospholipids. a. –OH group b. –CH3 group c. –CH4 group d. –OOH group e. None of the above Ans: A Difficulty: hard Feedback: 3.2 6. This type of membrane protein will extend throughout the entire membrane touching both the Intracellular fluid and the Extracellular fluid. a. Integral proteins b. Transmembrane proteins c. Integral proteins and Transmembrane proteins Ans: D Difficulty: medium Feedback: 3.2 7. Describe five different functions of embedded membrane proteins. Ans: Some proteins, like ion channels and carries, transport substances across the membrane. Proteins act as receptors for signaling chemicals to allow communication between cells. Other proteins are enzymes. There are also linker proteins that anchored cells to other cells. Lastly, some proteins act to help recognize cell identification. Difficulty: hard Feedback: 8. This portion of the cell membrane enables cell membranes to produce chemical products. . a. Receptors b. Phospholipids c. Cholesterol d. Enzymes e. Ligand Ans: D Difficulty: medium Feedback: 3.2 9. Which of the following is a function of a membrane protein that binds with hormones and neurotransmitters? a. Transporters b. Receptors c. Enzymes d. Linkers e. Cell Identification markers Ans: B Difficulty: medium Feedback: 3.2